the american economy is on the line. this is a moment for adult leadership. >> reporter: and taxes aren't the only sticking point. republicans are demanding the president come forward with a plan to limit spending on medicare and social security, something many democrats say is just not acceptable. >> i didn't have my own card with me. jill wouldn't let me have one. >> reporter: vice president biden got into the act today, too, taking a break from christmas shopping and snacking at costco to urge congress to extend middle class tax cuts. >> i think it's important congress acts now. i mean, right now. >> reporter: can mitt romney, with all his business experience, play a role on brokering a deal? well, don't count on it, diane. the president did not ask for his help today and the two simply agreed to keep in touch. and for now, nothing more. >> all right, thank you, jonathan karl. >>> and now, we move onto two towns that had reason to rejoice today. two tickets won that half a billion dollar lottery. one ticket sold in ar